Theory about the behavior of Olduvai hominins

The following theory about the behavior of Olduvai hominins is supported by evidence from butchery marks: a. Olduvai hominins scavenged the carcasses killed by carnivores. b. Olduvai hominins raised cattle for consumption, like modern-day people. c. Olduvai hominins hunted large prey such as mastodons. d. Olduvai hominins used fire to keep warm and cook meat.